Pipe-straightening rolls.



W. BARK. PIPE STRAIGHTBNIN G ROLLS. APPLIOATION FILED JULY 31,

Patented Dec. 13, 1910.

INVENTOR WITNESSES alob/w THE NORRIS EETERS 9a., wAsl-rmsrn'u, 1:.0.

- UNITED STATES PATENT OFFICE.

WILLIAM BARK, OF ELYRIA, OHIO, ASSIGNOR TO NATIONAL TUBE COMPANY, OFPITTSBURG, PENNSYLVANIA, A CORPORATION OF NEW J ERSEY.

PIPE-STRAIGHTENING ROLLS.

I Specification of Letters Patent.

Patented Dec. 13, 1910.

T 0 all whom 'it may concern:

Be it known that I, VVILLIAM BARK, of Elyria, Lorain county, Ohio, havelnvented a new and useful Improvement in Pipe- Straightening Itolls, ofwhich the follow1ng is a full, clear, and exact descript on, referencebeing had to the accompanymg drawings, forming part of thisspecificatlon, in which Figure 1 is a plan view of a palr of cross rollsconstructed and assembled in position in accordance with my invention;Flg. 2 is an elevation of the same taken in a plane transversely to theline of feed for the pipes while being straightened.

My invention relates to cross rolls for straightening tubes or pipes andthe ob ect of the invention is to provide an improved form ofstraightening roll by the use of which all kinks and bends in the p1p eWlll be removed without injury to the pipe or its weld. I

The invention consists in providlng straightening rolls of such shapethat when set at the proper angle to each other, the pomts of contactbetween the pipe or tube and the rolls will be in the form of a spiraland the contacting points on the collars or pro ections on one roll willbe on the opposite side of the pipe but not in the same plane with thepoints of contact on the collars provided on the opposing roll.

In the drawings, 2 and 3 represent concaved cross rolls which areassembled together at the proper angle to each other to straighten thepipes when placed between them and to feed the pipe forwardly in ahorizontal plane midway between the plane of the horizontal axes of theopposing rolls. Each of the rolls 2 and 3 is provided with necks 4t and5, by which the rolls are secured in adjustable bearings carried insuitable housings. The ends of the necks 4 and 5 on the rolls 2 and 3are squared or are provided with wabblers by which the rolls areconnected through coupling boxes and spindles to a driving motor whichis employed to positively rotate such rolls.

The roll housings, bearings and driving connections, not forming part ofmy invention, are not illustrated, as any of the well known forms ofsuch apparatus may be employed in connection with my improved rolls.

The roll 2 is shaped so that when it is set at a proper angle, thepoints of contact between the roll and the cylindrical pipe will be in aspiral line and the surface of the roll 2 is providedwithcircumferential projections or collars 6, which alternate lengthwiseacross the face of the roll with depressions 7 The roll 3 is arranged tocontact with the pipe in a spiral line and is also provided with collars8 which alternate with depressions 9 on the face of the bottom roll 3.The collars or projections 6 on the roll 2 are arranged to bring thepoints on the projections which are in contact with the pipe so as tocome opposite one of the grooves or recesses 9, in the face of the roll3, while the points contacting with the pipe on the collars 8 of theroll 3 are arranged to come opposite to the recesses or grooves 7, whichare in the face of the roll 2. Preferably, the width of the grooves orrecesses 7 and 9 is wider than that of the projections or collars whichseparate these recesses, although the recesses and collars may be of thesame width, when so desired.

In the operation of my improved apparatus, the rolls are assembled withrelation to each other with their axes at the proper angle and arepositively driven in the usual manner. The pipe to be straightened isfed into the pass formed between these rolls, as is the usual practice,the rotation of the rolls by contact with the pipe between them causingthe pipe to rotate and at the same time to be fed forwardlylongitudinally in the same manner as has been the case with theplane-faced rolls which have been heretofore used for straighteningpipes or tubes.

By reason of the groove in the face of one roll being oppositecontacting points on the projections on the opposite roll, the pipe isbent alternately in opposite directions on the same side of the axis ofthe pipe and by this means operates to effectively remove all kinks orbends in the pipes without injury to the pipes or causing any breaks inthe weld of such pipes. The rolls can be adjusted so as to bringsufiicient pressure upon the pipe when it is passed between the rolls toremove any imperfections 011 the surface of the pipe, such as kinks orbends, and deliver truly cylindrical and straight pipes from the rolls.

The advantage of my invention will be apparent to those skilled in theart. By providing grooved faces on the rolls, the pipe is subjected tobending alternately in opposite directions about the axis of the pipe,instead of as heretofore having a single line contact between each rolland the pipe which tends to smooth up the surface of the pipe bylessening any projections on the pipe, as is the case with theplane-faced rolls. The rolls can be manufactured more easily and cheaplythan the plane-faced rolls, which must be very accurately turned to theproper curvature. The rolls may be applied to existing apparatus, theonly change being in the construction of the faces of the rolls.

Modifications in the construction and arrangement of the rolls may bemade without departing from my invention.

The width and depth of the grooves and collars on the face of the rollsmay be varied as is desired, the number of grooves and the width of thegrooves relative to the width of the projections may also be changedwithout departing from my invention.

1 claim:

1. Pipe straightening rolls having their axes extending at oppositeangles to the axis of the pipe being straightened, each roll having aplurality of concentric collars forming separated points of contact withthe pipe, the points of contact on one roll being opposite thespacebetween the collars on the opposing roll; substantially as described.

2. Pipe straightening rolls having their axes extending at oppositeangles to the pipe being straightened and having alternate peripheralprojections and depressions in the faces thereof, the projections beingarranged to contact with the pipe at points intersecting a spiral lineon the surface of the pipe, and the points on one roll contacting withthe pipe being straightened being opposite depressions on the surface ofthe opposing roll; substantially as described.

In testimony whereof, I have hereunto setmy hand.

,VILLIAM BARK.

\Vitnesses FRANK M. NoxoN, J12, J. EDGAR SIMPSON.

